汾河流域气温变化时空特征分析

根据汾河流域上、中、下游典型市区54年(1954-2007年)气温观测资料,运用气候统计分析法、累积距平和信噪比法对汾河流域气温变化时空特征进行了分析。结果表明:汾河流域54年来气候呈现暖干化趋势,年均气温整体呈现上升趋势,总降水量整体呈现下降趋势;汾河流域气温变化呈上升趋势,10 a平均增幅为0.24℃;汾河流域进入21世纪初期气温上升幅度减小,且上、中、下游气温悬殊差距缩小;经气温变化的突变分析得出54年来汾河流域气温不存在突变年,1960年、1996年分别是汾河上游、汾河中、下游小的气温转折年,1993年是汾河流域大的气温转折年。

Temporal-spatial changes features of air temperature in Fenhe river basin

Based on the air temperature data of the upper,middle and lower reaches of Fenhe river basin in 54 years(in 1954-2007a),and using climatic statistics analysis method,accumulative annomaly and signal/noise ratio method,the temporal-spatial change characteristics of air temperature over the region were analyzed.The results indicated: ① The climate was warming and drying in Fenhe river basin in 54 years.Average annual temperature was on the rise as a whole,and total precipitation showed a downward trend.② Annual temperature was rising,and 10 years average of temperature increased about 0.24℃.③ The rise of warming was reducing in the early 21th century,and the temperature gap of upper,middle,and lower reaches was reduced.④ The temperature mutation Fenhe river basin did not exist,1960 and 1996 were the small temperature turning points,1993 was a big turning point in Fenhe river basin in Shanxi province.